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Unveiling dark haloes in lensing galaxies

Ferreras, I; Saha, P; Burles, S; (2008) Unveiling dark haloes in lensing galaxies. MON NOT R ASTRON SOC , 383 (3) 857 - 863. 10.1111/j.1365-2966.2007.12606.x.

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Abstract

We present a spatially resolved comparison of the stellar mass and total mass surface distributions of nine early-type galaxies. The galaxies are a subset of the Sloan Lens ACS Survey. The total mass distributions are obtained by exploring pixelated mass models that reproduce the lensed images. The stellar mass distributions are derived from population-synthesis models fit to the photometry of the lensing galaxies. Uncertainties - mainly model degeneracies - are also computed. Stars can account for all the mass in the inner regions. A Salpeter initial mass function actually gives too much stellar mass in the inner regions and hence appears ruled out. Dark matter becomes significant by the half-light radius and becomes increasingly dominant at larger radii. The stellar and dark components are closely aligned, but the actual ellipticities are not correlated. Finally, we attempt to intuitively summarize the results by rendering the density, stellar versus dark ratio, and uncertainties as false-colour maps.

Type:Article
Title:Unveiling dark haloes in lensing galaxies
DOI:10.1111/j.1365-2966.2007.12606.x
Keywords:gravitational lensing, galaxies : elliptical and lenticular, cD, galaxies : evolution, galaxies : haloes, galaxies : stellar content, dark matter, TO-LIGHT RATIO, AGE-METALLICITY DEGENERACY, STAR-FORMATION EFFICIENCY, ACS SURVEY, EINSTEIN RING-0047-2808, FUNDAMENTAL PLANE, EVOLUTION, STELLAR, MASS, INVERSION
UCL classification:UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Space and Climate Physics

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